<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        class="treeTable"
        :data="cateList"
        :columns="columns"
        show-index
        index-text=""
        :expand-type="false"
        :selection-type="false"
        :show-row-hover="false"
        border
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color:lightgreen;"></i>
          <i class="el-icon-circle-close" v-else style="color:red;"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level === 1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateForm(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 20]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @closed="addCateDialogClosed">
      <el-form ref="addCateFormRef" :rules="addCateFormRules" :model="addCateForm" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- :options指定数据源 -->
          <!-- :props指定配置项 -->
          <el-cascader v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="parentCateChanged" clearable></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑分类对话框 -->
    <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="50%" @closed="editCateDialogClosed">
      <el-form ref="editCateFormRef" :model="editCateForm" :rules="editCateFormRules" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类列表
      cateList: [],
      // 总数据条数
      total: 0,
      // 表格配置参数
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      // 添加分类表单
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      // 添加分类表单验证规则
      addCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      // 父级分类列表
      parentCateList: [],
      // 级联选择器配置项
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true
      },
      // 选中的父级分类id数组
      selectedKeys: [],
      // 控制编辑分类对话框
      editCateDialogVisible: false,
      // 修改的分类表单
      editCateForm: {},
      // 修改分类表单规则
      editCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    // 获取所有商品参数列表
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      // console.log(res.data)
      this.cateList = res.data.result
      this.total = res.data.total
    },
    // 分页
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newNum) {
      this.querInfo.pagenum = newNum
      this.getCateList()
    },
    // 显示添加分类对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类列表数据
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败！')
      }
      console.log(res.data)
      this.parentCateList = res.data
    },
    // 级联选择器选项发生变化触发函数
    parentCateChanged() {
      console.log(this.selectedKeys)
      // 如果选中的父级分类id数组的 length > 0 说明选了父级分类
      if (this.selectedKeys.length > 0) {
        // 父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        // 为当前分类等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 确定添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听关闭对话框重置表单
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 通过cat_id修改分类表单数据
    async showEditCateForm(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类表单数据失败！')
      }
      this.editCateForm = res.data
      // console.log(this.editCateForm)
      this.editCateDialogVisible = true
    },
    // 监听关闭修改分类对话框，重置修改表单
    editCateDialogClosed() {
      this.$refs.editCateFormRef.resetFields()
    },
    // 点击确定修改分类对话框
    editCate() {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('categories/' + this.editCateForm.cat_id, {
          cat_name: this.editCateForm.cat_name
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改分类名称失败！')
        }
        this.$message.success('修改分类名称成功')
        this.editCateDialogVisible = false
        this.getCateList()
      })
    },
    // 通过id删除分类
    async removeCateById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败！')
      }
      this.$message.success('删除分类成功')
      this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
